Double-source interferometry for reducing spurious noise fringes

被引：5

作者：

Liu, ZQ ^{[1
]}

Gemma, T ^{[1
]}

Udagawa, S ^{[1
]}

Takeda, M ^{[1
]}

机构：

[1] CORE, Ctr Technol, Optoelect Technol Dev Dept, Shinagawa Ku, Tokyo 1408601, Japan

来源：

INTERFEROMETRY XII: TECHNIQUES AND ANALYSIS | 2004年 / 5531卷

关键词：

D O I：

10.1117/12.560335

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A new technique of double-source interferometry is proposed, which can suppress spurious noise fringes arising from the interference with unwanted lights reflected from a surface that is not under test. Two collimated beams from a pair of mutually incoherent monochromatic sources are introduced into an interferometer to generate two sets of interference fringes, each of which is a superposition of signal fringes and noise fringes. The key idea is to choose the angle between the two beams in such a manner that the noise fringes generated by one beam become 180 degree out of phase from those generated by the other beam; thereby the noise fringes are canceled out while the signal fringes are maintained. The technique is also suited to the measurement of an optical parallel plate where noise fringes are unavoidable because of reflection from the rear surface. Experimental results are presented that demonstrate the validity of the proposed principle.

引用

页码：193 / 202

页数：10